The Tape Sash Balance is a popular
method for the replacement of rope and pulley balance systems. Simply mortise
the balance into the jamb and attach the tape to the sash. The standard tape
length will accommodate a sash up to 40 inches (101.6 centimeters) tall. Use a
single balance for sash up to 14 pounds (6.4 kilograms); two balances for sash
up to 28 pounds (12.7 kilograms).